Tiling in video encoding and decoding

ABSTRACT

Implementations are provided that relate, for example, to view tiling in video encoding and decoding. A particular method includes accessing a video picture that includes multiple pictures combined into a single picture (826), accessing information indicating how the multiple pictures in the accessed video picture are combined (806, 808, 822), decoding the video picture to provide a decoded representation of at least one of the multiple pictures (824, 826), and providing the accessed information and the decoded video picture as output (824, 826). Some other implementations format or process the information that indicates how multiple pictures included in a single video picture are combined into the single video picture, and format or process an encoded representation of the combined multiple pictures.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.16/144,971, filed on Sep. 27, 2018, which is a continuation of U.S.patent application Ser. No. 15/935,869, filed on Mar. 26, 2018 (now U.S.Pat. No. 10,129,557), which is a continuation of U.S. patent applicationSer. No. 15/879,280, filed on Jan. 24, 2018, (now U.S. Pat. No.9,986,254), which is a continuation of U.S. patent application Ser. No.15/791,238, filed on Oct. 23, 2017, (now U.S. Pat. No. 9,973,771), whichis a continuation of U.S. patent application Ser. No. 15/600,338, filedon May 19, 2017, (now U.S. Pat. No. 9,838,705), which is a continuationof U.S. patent application Ser. No. 15/244,192, filed on Aug. 23, 2016,(now U.S. Pat. No. 9,706,217), which is a continuation of U.S. patentapplication Ser. No. 14/946,252, filed on Nov. 19, 2015, (now U.S. Pat.No. 9,445,116), which is a continuation of U.S. patent application Ser.No. 14/817,597, filed Aug. 4, 2015, (now U.S. Pat. No. 9,232,235), whichis a continuation of U.S. patent application Ser. No. 14/735,371, filedJun. 10, 2015, (now U.S. Pat. No. 9,219,923), which is a continuation ofU.S. patent application Ser. No. 14/300,597, filed Jun. 10, 2014, (nowU.S. Pat. No. 9,185,384), which is a continuation of U.S. patentapplication Ser. No. 12/450,829, filed Oct. 13, 2009, now U.S. Pat. No.8,780,998, issued Jul. 15, 2014, which is a 371 of InternationalApplication No. PCT/US2008/004747 filed Apr. 11, 2008, which claimsbenefit of Provisional patent Application No. 60/925,400 filed Apr. 20,2007 and U.S. Provisional patent Application No. 60/923,014 filed Apr.12, 2007, herein incorporated by reference.

TECHNICAL FIELD

The present principles relate generally to video encoding and/ordecoding.

BACKGROUND

Video display manufacturers may use a framework of arranging or tilingdifferent views on a single frame. The views may then be extracted fromtheir respective locations and rendered.

SUMMARY

According to a general aspect, a video picture is accessed that includesmultiple pictures combined into a single picture. Information isaccessed indicating how the multiple pictures in the accessed videopicture are combined. The video picture is decoded to provide a decodedrepresentation of the combined multiple pictures. The accessedinformation and the decoded video picture are provided as output.

According to another general aspect, information is generated indicatinghow multiple pictures included in a video picture are combined into asingle picture. The video picture is encoded to provide an encodedrepresentation of the combined multiple pictures. The generatedinformation and encoded video picture are provided as output.

According to another general aspect, a signal or signal structureincludes information indicating how multiple pictures included in asingle video picture are combined into the single video picture. Thesignal or signal structure also includes an encoded representation ofthe combined multiple pictures.

According to another general aspect, a video picture is accessed thatincludes multiple pictures combined into a single picture. Informationis accessed that indicates how the multiple pictures in the accessedvideo picture are combined. The video picture is decoded to provide adecoded representation of at least one of the multiple pictures. Theaccessed information and the decoded representation are provided asoutput.

According to another general aspect, a video picture is accessed thatincludes multiple pictures combined into a single picture. Informationis accessed that indicates how the multiple pictures in the accessedvideo picture are combined. The video picture is decoded to provide adecoded representation of the combined multiple pictures. User input isreceived that selects at least one of the multiple pictures for display.A decoded output of the at least one selected picture is provided, thedecoded output being provided based on the accessed information, thedecoded representation, and the user input.

The details of one or more implementations are set forth in theaccompanying drawings and the description below. Even if described inone particular manner, it should be clear that implementations may beconfigured or embodied in various manners. For example, animplementation may be performed as a method, or embodied as an apparatusconfigured to perform a set of operations, or embodied as an apparatusstoring instructions for performing a set of operations, or embodied ina signal. Other aspects and features will become apparent from thefollowing detailed description considered in conjunction with theaccompanying drawings and the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram showing an example of four views tiled on a singleframe;

FIG. 2 is a diagram showing an example of four views flipped and tiledon a single frame;

FIG. 3 shows a block diagram for a video encoder to which the presentprinciples may be applied, in accordance with an embodiment of thepresent principles;

FIG. 4 shows a block diagram for a video decoder to which the presentprinciples may be applied, in accordance with an embodiment of thepresent principles;

FIGS. 5A and 5B are a flow diagram for a method for encoding picturesfor a plurality of views using the MPEG-4 AVC Standard, in accordancewith an embodiment of the present principles;

FIGS. 6A and 6B are a flow diagram for a method for decoding picturesfor a plurality of views using the MPEG-4 AVC Standard, in accordancewith an embodiment of the present principles;

FIGS. 7A and 7B are a flow diagram for a method for encoding picturesfor a plurality of views and depths using the MPEG-4 AVC Standard, inaccordance with an embodiment of the present principles;

FIGS. 8A and 8B are a flow diagram for a method for decoding picturesfor a plurality of views and depths using the MPEG-4 AVC Standard, inaccordance with an embodiment of the present principles;

FIG. 9 is a diagram showing an example of a depth signal, in accordancewith an embodiment of the present principles;

FIG. 10 is a diagram showing an example of a depth signal added as atile, in accordance with an embodiment of the present principles;

FIG. 11 is a diagram showing an example of 5 views tiled on a singleframe, in accordance with an embodiment of the present principles.

FIG. 12 is a block diagram for an exemplary Multi-view Video Coding(MVC) encoder to which the present principles may be applied, inaccordance with an embodiment of the present principles;

FIG. 13 is a block diagram for an exemplary Multi-view Video Coding(MVC) decoder to which the present principles may be applied, inaccordance with an embodiment of the present principles;

FIG. 14 is a flow diagram for a method for processing pictures for aplurality of views in preparation for encoding the pictures using themulti-view video coding (MVC) extension of the MPEG-4 AVC Standard, inaccordance with an embodiment of the present principles;

FIGS. 15A and 15B are a flow diagram for a method for encoding picturesfor a plurality of views using the multi-view video coding (MVC)extension of the MPEG-4 AVC Standard, in accordance with an embodimentof the present principles;

FIG. 16 is a flow diagram for a method for processing pictures for aplurality of views in preparation for decoding the pictures using themulti-view video coding (MVC) extension of the MPEG-4 AVC Standard, inaccordance with an embodiment of the present principles;

FIGS. 17A and 17B are a flow diagram for a method for decoding picturesfor a plurality of views using the multi-view video coding (MVC)extension of the MPEG-4 AVC Standard, in accordance with an embodimentof the present principles;

FIG. 18 is a flow diagram for a method for processing pictures for aplurality of views and depths in preparation for encoding the picturesusing the multi-view video coding (MVC) extension of the MPEG-4 AVCStandard, in accordance with an embodiment of the present principles;

FIGS. 19A and 19B are a flow diagram for a method for encoding picturesfor a plurality of views and depths using the multi-view video coding(MVC) extension of the MPEG-4 AVC Standard, in accordance with anembodiment of the present principles;

FIG. 20 is a flow diagram for a method for processing pictures for aplurality of views and depths in preparation for decoding the picturesusing the multi-view video coding (MVC) extension of the MPEG-4 AVCStandard, in accordance with an embodiment of the present principles;

FIGS. 21A and 21B are a flow diagram for a method for decoding picturesfor a plurality of views and depths using the multi-view video coding(MVC) extension of the MPEG-4 AVC Standard, in accordance with anembodiment of the present principles;

FIG. 22 is a diagram showing tiling examples at the pixel level, inaccordance with an embodiment of the present principles; and

FIG. 23 shows a block diagram for a video processing device to which thepresent principles may be applied, in accordance with an embodiment ofthe present principles.

DETAILED DESCRIPTION

Various implementations are directed to methods and apparatus for viewtiling in video encoding and decoding. It will thus be appreciated thatthose skilled in the art will be able to devise various arrangementsthat, although not explicitly described or shown herein, embody thepresent principles and are included within its spirit and scope.

All examples and conditional language recited herein are intended forpedagogical purposes to aid the reader in understanding the presentprinciples and the concepts contributed by the inventor(s) to furtheringthe art, and are to be construed as being without limitation to suchspecifically recited examples and conditions.

Moreover, all statements herein reciting principles, aspects, andembodiments of the present principles, as well as specific examplesthereof, are intended to encompass both structural and functionalequivalents thereof. Additionally, it is intended that such equivalentsinclude both currently known equivalents as well as equivalentsdeveloped in the future, i.e., any elements developed that perform thesame function, regardless of structure.

Thus, for example, it will be appreciated by those skilled in the artthat the block diagrams presented herein represent conceptual views ofillustrative circuitry embodying the present principles. Similarly, itwill be appreciated that any flow charts, flow diagrams, statetransition diagrams, pseudocode, and the like represent variousprocesses which may be substantially represented in computer readablemedia and so executed by a computer or processor, whether or not suchcomputer or processor is explicitly shown.

The functions of the various elements shown in the figures may beprovided through the use of dedicated hardware as well as hardwarecapable of executing software in association with appropriate software.When provided by a processor, the functions may be provided by a singlededicated processor, by a single shared processor, or by a plurality ofindividual processors, some of which may be shared. Moreover, explicituse of the term “processor” or “controller” should not be construed torefer exclusively to hardware capable of executing software, and mayimplicitly include, without limitation, digital signal processor (“DSP”)hardware, read-only memory (“ROM”) for storing software, random accessmemory (“RAM”), and non-volatile storage.

Other hardware, conventional and/or custom, may also be included.Similarly, any switches shown in the figures are conceptual only. Theirfunction may be carried out through the operation of program logic,through dedicated logic, through the interaction of program control anddedicated logic, or even manually, the particular technique beingselectable by the implementer as more specifically understood from thecontext.

In the claims hereof, any element expressed as a means for performing aspecified function is intended to encompass any way of performing thatfunction including, for example, a) a combination of circuit elementsthat performs that function or b) software in any form, including,therefore, firmware, microcode or the like, combined with appropriatecircuitry for executing that software to perform the function. Thepresent principles as defined by such claims reside in the fact that thefunctionalities provided by the various recited means are combined andbrought together in the manner which the claims call for. It is thusregarded that any means that can provide those functionalities areequivalent to those shown herein.

Reference in the specification to “one embodiment” (or “oneimplementation”) or “an embodiment” (or “an implementation”) of thepresent principles means that a particular feature, structure,characteristic, and so forth described in connection with the embodimentis included in at least one embodiment of the present principles. Thus,the appearances of the phrase “in one embodiment” or “in an embodiment”appearing in various places throughout the specification are notnecessarily all referring to the same embodiment.

It is to be appreciated that the use of the terms “and/or” and “at leastone of”, for example, in the cases of “A and/or B” and “at least one ofA and B”, is intended to encompass the selection of the first listedoption (A) only, or the selection of the second listed option (B) only,or the selection of both options (A and B). As a further example, in thecases of “A, B, and/or C” and “at least one of A, B, and C”, suchphrasing is intended to encompass the selection of the first listedoption (A) only, or the selection of the second listed option (B) only,or the selection of the third listed option (C) only, or the selectionof the first and the second listed options (A and B) only, or theselection of the first and third listed options (A and C) only, or theselection of the second and third listed options (B and C) only, or theselection of all three options (A and B and C). This may be extended, asreadily apparent by one of ordinary skill in this and related arts, foras many items listed.

Moreover, it is to be appreciated that while one or more embodiments ofthe present principles are described herein with respect to the MPEG-4AVC standard, the present principles are not limited to solely thisstandard and, thus, may be utilized with respect to other standards,recommendations, and extensions thereof, particularly video codingstandards, recommendations, and extensions thereof, including extensionsof the MPEG-4 AVC standard, while maintaining the spirit of the presentprinciples.

Further, it is to be appreciated that while one or more otherembodiments of the present principles are described herein with respectto the multi-view video coding extension of the MPEG-4 AVC standard, thepresent principles are not limited to solely this extension and/or thisstandard and, thus, may be utilized with respect to other video codingstandards, recommendations, and extensions thereof relating tomulti-view video coding, while maintaining the spirit of the presentprinciples. Multi-view video coding (MVC) is the compression frameworkfor the encoding of multi-view sequences. A Multi-view Video Coding(MVC) sequence is a set of two or more video sequences that capture thesame scene from a different view point.

Also, it is to be appreciated that while one or more other embodimentsof the present principles are described herein that use depthinformation with respect to video content, the present principles arenot limited to such embodiments and, thus, other embodiments may beimplemented that do not use depth information, while maintaining thespirit of the present principles.

Additionally, as used herein, “high level syntax” refers to syntaxpresent in the bitstream that resides hierarchically above themacroblock layer. For example, high level syntax, as used herein, mayrefer to, but is not limited to, syntax at the slice header level,Supplemental Enhancement Information (SEI) level, Picture Parameter Set(PPS) level, Sequence Parameter Set (SPS) level, View Parameter Set(VPS), and Network Abstraction Layer (NAL) unit header level.

In the current implementation of multi-video coding (MVC) based on theInternational Organization for Standardization/InternationalElectrotechnical Commission (ISO/IEC) Moving Picture Experts Group-4(MPEG-4) Part 10 Advanced Video Coding (AVC) standard/InternationalTelecommunication Union, Telecommunication Sector (ITU-T) H.264Recommendation (hereinafter the “MPEG-4 AVC Standard”), the referencesoftware achieves multi-view prediction by encoding each view with asingle encoder and taking into consideration the cross-view references.Each view is coded as a separate bitstream by the encoder in itsoriginal resolution and later all the bitstreams are combined to form asingle bitstream which is then decoded. Each view produces a separateYUV decoded output.

Another approach for multi-view prediction involves grouping a set ofviews into pseudo views. In one example of this approach, we can tilethe pictures from every N views out of the total M views (sampled at thesame time) on a larger frame or a super frame with possible downsamplingor other operations. Turning to FIG. 1, an example of four views tiledon a single frame is indicated generally by the reference numeral 100.All four views are in their normal orientation.

Turning to FIG. 2, an example of four views flipped and tiled on asingle frame is indicated generally by the reference numeral 200. Thetop-left view is in its normal orientation. The top-right view isflipped horizontally. The bottom-left view is flipped vertically. Thebottom-right view is flipped both horizontally and vertically. Thus, ifthere are four views, then a picture from each view is arranged in asuper-frame like a tile. This results in a single un-coded inputsequence with a large resolution.

Alternatively, we can downsample the image to produce a smallerresolution. Thus, we create multiple sequences which each includedifferent views that are tiled together. Each such sequence then forms apseudo view, where each pseudo view includes N different tiled views.FIG. 1 shows one pseudo-view, and FIG. 2 shows another pseudo-view.These pseudo views can then be encoded using existing video codingstandards such as the ISO/IEC MPEG-2 Standard and the MPEG-4 AVCStandard.

Yet another approach for multi-view prediction simply involves encodingthe different views independently using a new standard and, afterdecoding, tiling the views as required by the player.

Further, in another approach, the views can also be tiled in a pixelwise way. For example, in a super view that is composed of four views,pixel (x, y) may be from view 0, while pixel (x+1, y) may be from view1, pixel (x, y+1) may be from view 2, and pixel (x+1, y+1) may be fromview 3.

Many displays manufacturers use such a frame work of arranging or tilingdifferent views on a single frame and then extracting the views fromtheir respective locations and rendering them. In such cases, there isno standard way to determine if the bitstream has such a property. Thus,if a system uses the method of tiling pictures of different views in alarge frame, then the method of extracting the different views isproprietary.

However, there is no standard way to determine if the bitstream has sucha property. We propose high level syntax in order to facilitate therenderer or player to extract such information in order to assist indisplay or other post-processing. It is also possible the sub-pictureshave different resolutions and some upsampling may be needed toeventually render the view. The user may want to have the method ofupsample indicated in the high level syntax as well. Additionally,parameters to change the depth focus can also be transmitted.

In an embodiment, we propose a new Supplemental Enhancement Information(SEI) message for signaling multi-view information in a MPEG-4 AVCStandard compatible bitstream where each picture includes sub-pictureswhich belong to a different view. The embodiment is intended, forexample, for the easy and convenient display of multi-view video streamson three-dimensional (3D) monitors which may use such a framework. Theconcept can be extended to other video coding standards andrecommendations signaling such information using high level syntax.

Moreover, in an embodiment, we propose a signaling method of how toarrange views before they are sent to the multi-view video encoderand/or decoder. Advantageously, the embodiment may lead to a simplifiedimplementation of the multi-view coding, and may benefit the codingefficiency. Certain views can be put together and form a pseudo view orsuper view and then the tiled super view is treated as a normal view bya common multi-view video encoder and/or decoder, for example, as perthe current MPEG-4 AVC Standard based implementation of multi-view videocoding. A new flag is proposed in the Sequence Parameter Set (SPS)extension of multi-view video coding to signal the use of the techniqueof pseudo views. The embodiment is intended for the easy and convenientdisplay of multi-view video streams on 3D monitors which may use such aframework.

Encoding/Decoding Using a Single-View Video Encoding/DecodingStandard/Recommendation

In the current implementation of multi-video coding (MVC) based on theInternational Organization for Standardization/InternationalElectrotechnical Commission (ISO/IEC) Moving Picture Experts Group-4(MPEG-4) Part 10 Advanced Video Coding (AVC) standard/InternationalTelecommunication Union, Telecommunication Sector (ITU-T) H.264Recommendation (hereinafter the “MPEG-4 AVC Standard”), the referencesoftware achieves multi-view prediction by encoding each view with asingle encoder and taking into consideration the cross-view references.Each view is coded as a separate bitstream by the encoder in itsoriginal resolution and later all the bitstreams are combined to form asingle bitstream which is then decoded. Each view produces a separateYUV decoded output.

Another approach for multi-view prediction involves tiling the picturesfrom each view (sampled at the same time) on a larger frame or a superframe with a possible downsampling operation. Turning to FIG. 1, anexample of four views tiled on a single frame is indicated generally bythe reference numeral 100. Turning to FIG. 2, an example of four viewsflipped and tiled on a single frame is indicated generally by thereference numeral 200. Thus, if there are four views, then a picturefrom each view is arranged in a super-frame like a tile. This results ina single un-coded input sequence with a large resolution. This signalcan then be encoded using existing video coding standards such as theISO/IEC MPEG-2 Standard and the MPEG-4 AVC Standard.

Yet another approach for multi-view prediction simply involves encodingthe different views independently using a new standard and, afterdecoding, tiling the views as required by the player.

Many displays manufacturers use such a frame work of arranging or tilingdifferent views on a single frame and then extracting the views fromtheir respective locations and rendering them. In such cases, there isno standard way to determine if the bitstream has such a property. Thus,if a system uses the method of tiling pictures of different views in alarge frame, then the method of extracting the different views isproprietary.

Turning to FIG. 3, a video encoder capable of performing video encodingin accordance with the MPEG-4 AVC standard is indicated generally by thereference numeral 300.

The video encoder 300 includes a frame ordering buffer 310 having anoutput in signal communication with a non-inverting input of a combiner385. An output of the combiner 385 is connected in signal communicationwith a first input of a transformer and quantizer 325. An output of thetransformer and quantizer 325 is connected in signal communication witha first input of an entropy coder 345 and a first input of an inversetransformer and inverse quantizer 350. An output of the entropy coder345 is connected in signal communication with a first non-invertinginput of a combiner 390. An output of the combiner 390 is connected insignal communication with a first input of an output buffer 335.

A first output of an encoder controller 305 is connected in signalcommunication with a second input of the frame ordering buffer 310, asecond input of the inverse transformer and inverse quantizer 350, aninput of a picture-type decision module 315, an input of amacroblock-type (MB-type) decision module 320, a second input of anintra prediction module 360, a second input of a deblocking filter 365,a first input of a motion compensator 370, a first input of a motionestimator 375, and a second input of a reference picture buffer 380.

A second output of the encoder controller 305 is connected in signalcommunication with a first input of a Supplemental EnhancementInformation (SEI) inserter 330, a second input of the transformer andquantizer 325, a second input of the entropy coder 345, a second inputof the output buffer 335, and an input of the Sequence Parameter Set(SPS) and Picture Parameter Set (PPS) inserter 340.

A first output of the picture-type decision module 315 is connected insignal communication with a third input of a frame ordering buffer 310.A second output of the picture-type decision module 315 is connected insignal communication with a second input of a macroblock-type decisionmodule 320.

An output of the Sequence Parameter Set (SPS) and Picture Parameter Set(PPS) inserter 340 is connected in signal communication with a thirdnon-inverting input of the combiner 390. An output of the SEI Inserter330 is connected in signal communication with a second non-invertinginput of the combiner 390.

An output of the inverse quantizer and inverse transformer 350 isconnected in signal communication with a first non-inverting input of acombiner 319. An output of the combiner 319 is connected in signalcommunication with a first input of the intra prediction module 360 anda first input of the deblocking filter 365. An output of the deblockingfilter 365 is connected in signal communication with a first input of areference picture buffer 380. An output of the reference picture buffer380 is connected in signal communication with a second input of themotion estimator 375 and with a first input of a motion compensator 370.A first output of the motion estimator 375 is connected in signalcommunication with a second input of the motion compensator 370. Asecond output of the motion estimator 375 is connected in signalcommunication with a third input of the entropy coder 345.

An output of the motion compensator 370 is connected in signalcommunication with a first input of a switch 397. An output of the intraprediction module 360 is connected in signal communication with a secondinput of the switch 397. An output of the macroblock-type decisionmodule 320 is connected in signal communication with a third input ofthe switch 397 in order to provide a control input to the switch 397.The third input of the switch 397 determines whether or not the “data”input of the switch (as compared to the control input, i.e., the thirdinput) is to be provided by the motion compensator 370 or the intraprediction module 360. The output of the switch 397 is connected insignal communication with a second non-inverting input of the combiner319 and with an inverting input of the combiner 385.

Inputs of the frame ordering buffer 310 and the encoder controller 105are available as input of the encoder 300, for receiving an inputpicture 301. Moreover, an input of the Supplemental EnhancementInformation (SEI) inserter 330 is available as an input of the encoder300, for receiving metadata. An output of the output buffer 335 isavailable as an output of the encoder 300, for outputting a bitstream.

Turning to FIG. 4, a video decoder capable of performing video decodingin accordance with the MPEG-4 AVC standard is indicated generally by thereference numeral 400.

The video decoder 400 includes an input buffer 410 having an outputconnected in signal communication with a first input of the entropydecoder 445. A first output of the entropy decoder 445 is connected insignal communication with a first input of an inverse transformer andinverse quantizer 450. An output of the inverse transformer and inversequantizer 450 is connected in signal communication with a secondnon-inverting input of a combiner 425. An output of the combiner 425 isconnected in signal communication with a second input of a deblockingfilter 465 and a first input of an intra prediction module 460. A secondoutput of the deblocking filter 465 is connected in signal communicationwith a first input of a reference picture buffer 480. An output of thereference picture buffer 480 is connected in signal communication with asecond input of a motion compensator 470.

A second output of the entropy decoder 445 is connected in signalcommunication with a third input of the motion compensator 470 and afirst input of the deblocking filter 465. A third output of the entropydecoder 445 is connected in signal communication with an input of adecoder controller 405. A first output of the decoder controller 405 isconnected in signal communication with a second input of the entropydecoder 445. A second output of the decoder controller 405 is connectedin signal communication with a second input of the inverse transformerand inverse quantizer 450. A third output of the decoder controller 405is connected in signal communication with a third input of thedeblocking filter 465. A fourth output of the decoder controller 405 isconnected in signal communication with a second input of the intraprediction module 460, with a first input of the motion compensator 470,and with a second input of the reference picture buffer 480.

An output of the motion compensator 470 is connected in signalcommunication with a first input of a switch 497. An output of the intraprediction module 460 is connected in signal communication with a secondinput of the switch 497. An output of the switch 497 is connected insignal communication with a first non-inverting input of the combiner425.

An input of the input buffer 410 is available as an input of the decoder400, for receiving an input bitstream. A first output of the deblockingfilter 465 is available as an output of the decoder 400, for outputtingan output picture.

Turning to FIG. 5, including FIGS. 5A and 5B, an exemplary method forencoding pictures for a plurality of views using the MPEG-4 AVC Standardis indicated generally by the reference numeral 500.

The method 500 includes a start block 502 that passes control to afunction block 504. The function block 504 arranges each view at aparticular time instance as a sub-picture in tile format, and passescontrol to a function block 506. The function block 506 sets a syntaxelement num_coded_views_minus1, and passes control to a function block508. The function block 508 sets syntax elementsorg_pic_width_in_mbs_minus1 and org_pic_height_in_mbs_minus1, and passescontrol to a function block 510. The function block 510 sets a variablei equal to zero, and passes control to a decision block 512. Thedecision block 512 determines whether or not the variable i is less thanthe number of views. If so, then control is passed to a function block514. Otherwise, control is passed to a function block 524.

The function block 514 sets a syntax element view_id[i], and passescontrol to a function block 516. The function block 516 sets a syntaxelement num_parts[view_id[i]], and passes control to a function block518. The function block 518 sets a variable j equal to zero, and passescontrol to a decision block 520. The decision block 520 determineswhether or not the current value of the variable j is less than thecurrent value of the syntax element num_parts[view_id[i]]. If so, thencontrol is passed to a function block 522. Otherwise, control is passedto a function block 528.

The function block 522 sets the following syntax elements, incrementsthe variable j, and then returns control to the decision block 520:depth_flag[view_id[i]][j]; flip_dir[view_id[i]][j];loc_left_offset[view_id[i]][j]; loc_top_offset[view_id[i]][j];frame_crop_left_offset[view_id[i]][j];frame_crop_right_offset[view_id[i]][j];frame_crop_top_offset[view_id[i]][j]; andframe_crop_bottom_offset[view_id[i]][j].

The function block 528 sets a syntax elementupsample_view_flag[view_id[i]], and passes control to a decision block530. The decision block 530 determines whether or not the current valueof the syntax element upsample_view_flag[view_id[i]] is equal to one. Ifso, then control is passed to a function block 532. Otherwise, controlis passed to a decision block 534.

The function block 532 sets a syntax elementupsample_filter[view_id[i]], and passes control to the decision block534.

The decision block 534 determines whether or not the current value ofthe syntax element upsample_filter[view_id[i]] is equal to three. If so,then control is passed to a function block 536. Otherwise, control ispassed to a function block 540.

The function block 536 sets the following syntax elements and passescontrol to a function block 538: vert_dim[view_id[i]];hor_dim[view_id[i]]; and quantizer[view_id[i]].

The function block 538 sets the filter coefficients for each YUVcomponent, and passes control to the function block 540.

The function block 540 increments the variable i, and returns control tothe decision block 512.

The function block 524 writes these syntax elements to at least one ofthe Sequence Parameter Set (SPS), Picture Parameter Set (PPS),Supplemental Enhancement Information (SEI) message, Network AbstractionLayer (NAL) unit header, and slice header, and passes control to afunction block 526. The function block 526 encodes each picture usingthe MPEG-4 AVC Standard or other single view codec, and passes controlto an end block 599.

Turning to FIG. 6, including FIGS. 6A and 6B, an exemplary method fordecoding pictures for a plurality of views using the MPEG-4 AVC Standardis indicated generally by the reference numeral 600.

The method 600 includes a start block 602 that passes control to afunction block 604. The function block 604 parses the following syntaxelements from at least one of the Sequence Parameter Set (SPS), PictureParameter Set (PPS), Supplemental Enhancement Information (SEI) message,Network Abstraction Layer (NAL) unit header, and slice header, andpasses control to a function block 606. The function block 606 parses asyntax element num_coded_views_minus1, and passes control to a functionblock 608. The function block 608 parses syntax elementsorg_pic_width_in_mbs_minus1 and org_pic_height_in_mbs_minus1, and passescontrol to a function block 610. The function block 610 sets a variablei equal to zero, and passes control to a decision block 612. Thedecision block 612 determines whether or not the variable i is less thanthe number of views. If so, then control is passed to a function block614. Otherwise, control is passed to a function block 624.

The function block 614 parses a syntax element view_id[i], and passescontrol to a function block 616. The function block 616 parses a syntaxelement num_parts_minus1[view_id[i]], and passes control to a functionblock 618. The function block 618 sets a variable j equal to zero, andpasses control to a decision block 620. The decision block 620determines whether or not the current value of the variable j is lessthan the current value of the syntax element num_parts[view_id[i]]. Ifso, then control is passed to a function block 622. Otherwise, controlis passed to a function block 628.

The function block 622 parses the following syntax elements, incrementsthe variable j, and then returns control to the decision block 620:depth_flag[view_id[i]][j]; flip_dir[view_id[i]][j];loc_left_offset[view_id[i]][j]; loc_top_offset[view_id[i]][j];frame_crop_left_offset[view_id[i]][j];frame_crop_right_offset[view_id[i]][j];frame_crop_top_offset[view_id[i]][j]; andframe_crop_bottom_offset[view_id[i]][j].

The function block 628 parses a syntax elementupsample_view_flag[view_id[i]], and passes control to a decision block630. The decision block 630 determines whether or not the current valueof the syntax element upsample_view_flag[view_id[i]] is equal to one. Ifso, then control is passed to a function block 632. Otherwise, controlis passed to a decision block 634.

The function block 632 parses a syntax elementupsample_filter[view_id[i]], and passes control to the decision block634.

The decision block 634 determines whether or not the current value ofthe syntax element upsample_filter[view_id[i]] is equal to three. If so,then control is passed to a function block 636. Otherwise, control ispassed to a function block 640.

The function block 636 parses the following syntax elements and passescontrol to a function block 638: vert_dim[view_id[i]];hor_dim[view_id[i]]; and quantizer[view_id[i]].

The function block 638 parses the filter coefficients for each YUVcomponent, and passes control to the function block 640.

The function block 640 increments the variable i, and returns control tothe decision block 612.

The function block 624 decodes each picture using the MPEG-4 AVCStandard or other single view codec, and passes control to a functionblock 626. The function block 626 separates each view from the pictureusing the high level syntax, and passes control to an end block 699.

Turning to FIG. 7, including FIGS. 7A and 7B, an exemplary method forencoding pictures for a plurality of views and depths using the MPEG-4AVC Standard is indicated generally by the reference numeral 700.

The method 700 includes a start block 702 that passes control to afunction block 704. The function block 704 arranges each view andcorresponding depth at a particular time instance as a sub-picture intile format, and passes control to a function block 706. The functionblock 706 sets a syntax element num_coded_views_minus1, and passescontrol to a function block 708. The function block 708 sets syntaxelements org_pic_width_in_mbs_minus1 and org_pic_height_in_mbs_minus1,and passes control to a function block 710. The function block 710 setsa variable i equal to zero, and passes control to a decision block 712.The decision block 712 determines whether or not the variable i is lessthan the number of views. If so, then control is passed to a functionblock 714. Otherwise, control is passed to a function block 724.

The function block 714 sets a syntax element view_id[i], and passescontrol to a function block 716. The function block 716 sets a syntaxelement num_parts[view_id[i]], and passes control to a function block718. The function block 718 sets a variable j equal to zero, and passescontrol to a decision block 720. The decision block 720 determineswhether or not the current value of the variable j is less than thecurrent value of the syntax element num_parts[view_id[i]]. If so, thencontrol is passed to a function block 722. Otherwise, control is passedto a function block 728.

The function block 722 sets the following syntax elements, incrementsthe variable j, and then returns control to the decision block 720:depth_flag[view_id[i]][j]; flip_dir[view_id[i]][j];loc_left_offset[view_id[i]][j]; loc_top_offset[view_id[i]][j];frame_crop_left_offset[view_id[i]][j];frame_crop_right_offset[view_id[i]][j];frame_crop_top_offset[view_id[i]][j]; andframe_crop_bottom_offset[view_id[i]][j].

The function block 728 sets a syntax elementupsample_view_flag[view_id[i]], and passes control to a decision block730. The decision block 730 determines whether or not the current valueof the syntax element upsample_view_flag[view_id[i]] is equal to one. Ifso, then control is passed to a function block 732. Otherwise, controlis passed to a decision block 734.

The function block 732 sets a syntax elementupsample_filter[view_id[i]], and passes control to the decision block734.

The decision block 734 determines whether or not the current value ofthe syntax element upsample_filter[view_id[i]] is equal to three. If so,then control is passed to a function block 736. Otherwise, control ispassed to a function block 740.

The function block 736 sets the following syntax elements and passescontrol to a function block 738: vert_dim[view_id[i]];hor_dim[view_id[i]]; and quantizer[view_id[i]].

The function block 738 sets the filter coefficients for each YUVcomponent, and passes control to the function block 740.

The function block 740 increments the variable i, and returns control tothe decision block 712.

The function block 724 writes these syntax elements to at least one ofthe Sequence Parameter Set (SPS), Picture Parameter Set (PPS),Supplemental Enhancement Information (SEI) message, Network AbstractionLayer (NAL) unit header, and slice header, and passes control to afunction block 726. The function block 726 encodes each picture usingthe MPEG-4 AVC Standard or other single view codec, and passes controlto an end block 799.

Turning to FIG. 8, including FIGS. 8A and 8B, an exemplary method fordecoding pictures for a plurality of views and depths using the MPEG-4AVC Standard is indicated generally by the reference numeral 800.

The method 800 includes a start block 802 that passes control to afunction block 804. The function block 804 parses the following syntaxelements from at least one of the Sequence Parameter Set (SPS), PictureParameter Set (PPS), Supplemental Enhancement Information (SEI) message,Network Abstraction Layer (NAL) unit header, and slice header, andpasses control to a function block 806. The function block 806 parses asyntax element num_coded_views_minus1, and passes control to a functionblock 808. The function block 808 parses syntax elementsorg_pic_width_in_mbs_minus1 and org_pic_height_in_mbs_minus1, and passescontrol to a function block 810. The function block 810 sets a variablei equal to zero, and passes control to a decision block 812. Thedecision block 812 determines whether or not the variable i is less thanthe number of views. If so, then control is passed to a function block814. Otherwise, control is passed to a function block 824.

The function block 814 parses a syntax element view_id[i], and passescontrol to a function block 816. The function block 816 parses a syntaxelement num_parts_minus1[view_id[i]], and passes control to a functionblock 818. The function block 818 sets a variable j equal to zero, andpasses control to a decision block 820. The decision block 820determines whether or not the current value of the variable j is lessthan the current value of the syntax element num_parts[view_id[i]]. Ifso, then control is passed to a function block 822. Otherwise, controlis passed to a function block 828.

The function block 822 parses the following syntax elements, incrementsthe variable j, and then returns control to the decision block 820:depth_flag[view_id[i]][j]; flip_dir[view_id[i]][j];loc_left_offset[view_id[i]][j]; loc_top_offset[view_id[i]][j];frame_crop_left_offset[view_id[i]][j];frame_crop_right_offset[view_id[i]][j];frame_crop_top_offset[view_id[i]][j]; andframe_crop_bottom_offset[view_id[i]][j].

The function block 828 parses a syntax elementupsample_view_flag[view_id[i]], and passes control to a decision block830. The decision block 830 determines whether or not the current valueof the syntax element upsample_view_flag[view_id[i]] is equal to one. Ifso, then control is passed to a function block 832. Otherwise, controlis passed to a decision block 834.

The function block 832 parses a syntax elementupsample_filter[view_id[i]], and passes control to the decision block834.

The decision block 834 determines whether or not the current value ofthe syntax element upsample_filter[view_id[i]] is equal to three. If so,then control is passed to a function block 836. Otherwise, control ispassed to a function block 840.

The function block 836 parses the following syntax elements and passescontrol to a function block 838: vert_dim[view_id[i]];hor_dim[view_id[i]]; and quantizer[view_id[i]].

The function block 838 parses the filter coefficients for each YUVcomponent, and passes control to the function block 840.

The function block 840 increments the variable i, and returns control tothe decision block 812.

The function block 824 decodes each picture using the MPEG-4 AVCStandard or other single view codec, and passes control to a functionblock 826. The function block 826 separates each view and correspondingdepth from the picture using the high level syntax, and passes controlto a function block 827. The function block 827 potentially performsview synthesis using the extracted view and depth signals, and passescontrol to an end block 899.

With respect to the depth used in FIGS. 7 and 8, FIG. 9 shows an exampleof a depth signal 900, where depth is provided as a pixel value for eachcorresponding location of an image (not shown). Further, FIG. 10 showsan example of two depth signals included in a tile 1000. The top-rightportion of tile 1000 is a depth signal having depth values correspondingto the image on the top-left of tile 1000. The bottom-right portion oftile 1000 is a depth signal having depth values corresponding to theimage on the bottom-left of tile 1000.

Turning to FIG. 11, an example of 5 views tiled on a single frame isindicated generally by the reference numeral 1100. The top four viewsare in a normal orientation. The fifth view is also in a normalorientation, but is split into two portions along the bottom of tile1100. A left-portion of the fifth view shows the “top” of the fifthview, and a right-portion of the fifth view shows the “bottom” of thefifth view.

Encoding/Decoding Using a Multi-View Video Encoding/DecodingStandard/Recommendation

Turning to FIG. 12, an exemplary Multi-view Video Coding (MVC) encoderis indicated generally by the reference numeral 1200. The encoder 1200includes a combiner 1205 having an output connected in signalcommunication with an input of a transformer 1210. An output of thetransformer 1210 is connected in signal communication with an input ofquantizer 1215. An output of the quantizer 1215 is connected in signalcommunication with an input of an entropy coder 1220 and an input of aninverse quantizer 1225. An output of the inverse quantizer 1225 isconnected in signal communication with an input of an inversetransformer 1230. An output of the inverse transformer 1230 is connectedin signal communication with a first non-inverting input of a combiner1235. An output of the combiner 1235 is connected in signalcommunication with an input of an intra predictor 1245 and an input of adeblocking filter 1250. An output of the deblocking filter 1250 isconnected in signal communication with an input of a reference picturestore 1255 (for view i). An output of the reference picture store 1255is connected in signal communication with a first input of a motioncompensator 1275 and a first input of a motion estimator 1280. An outputof the motion estimator 1280 is connected in signal communication with asecond input of the motion compensator 1275

An output of a reference picture store 1260 (for other views) isconnected in signal communication with a first input of a disparityestimator 1270 and a first input of a disparity compensator 1265. Anoutput of the disparity estimator 1270 is connected in signalcommunication with a second input of the disparity compensator 1265.

An output of the entropy decoder 1220 is available as an output of theencoder 1200. A non-inverting input of the combiner 1205 is available asan input of the encoder 1200, and is connected in signal communicationwith a second input of the disparity estimator 1270, and a second inputof the motion estimator 1280. An output of a switch 1285 is connected insignal communication with a second non-inverting input of the combiner1235 and with an inverting input of the combiner 1205. The switch 1285includes a first input connected in signal communication with an outputof the motion compensator 1275, a second input connected in signalcommunication with an output of the disparity compensator 1265, and athird input connected in signal communication with an output of theintra predictor 1245.

A mode decision module 1240 has an output connected to the switch 1285for controlling which input is selected by the switch 1285.

Turning to FIG. 13, an exemplary Multi-view Video Coding (MVC) decoderis indicated generally by the reference numeral 1300. The decoder 1300includes an entropy decoder 1305 having an output connected in signalcommunication with an input of an inverse quantizer 1310. An output ofthe inverse quantizer is connected in signal communication with an inputof an inverse transformer 1315. An output of the inverse transformer1315 is connected in signal communication with a first non-invertinginput of a combiner 1320. An output of the combiner 1320 is connected insignal communication with an input of a deblocking filter 1325 and aninput of an intra predictor 1330. An output of the deblocking filter1325 is connected in signal communication with an input of a referencepicture store 1340 (for view i). An output of the reference picturestore 1340 is connected in signal communication with a first input of amotion compensator 1335.

An output of a reference picture store 1345 (for other views) isconnected in signal communication with a first input of a disparitycompensator 1350.

An input of the entropy coder 1305 is available as an input to thedecoder 1300, for receiving a residue bitstream. Moreover, an input of amode module 1360 is also available as an input to the decoder 1300, forreceiving control syntax to control which input is selected by theswitch 1355. Further, a second input of the motion compensator 1335 isavailable as an input of the decoder 1300, for receiving motion vectors.Also, a second input of the disparity compensator 1350 is available asan input to the decoder 1300, for receiving disparity vectors.

An output of a switch 1355 is connected in signal communication with asecond non-inverting input of the combiner 1320. A first input of theswitch 1355 is connected in signal communication with an output of thedisparity compensator 1350. A second input of the switch 1355 isconnected in signal communication with an output of the motioncompensator 1335. A third input of the switch 1355 is connected insignal communication with an output of the intra predictor 1330. Anoutput of the mode module 1360 is connected in signal communication withthe switch 1355 for controlling which input is selected by the switch1355. An output of the deblocking filter 1325 is available as an outputof the decoder 1300.

Turning to FIG. 14, an exemplary method for processing pictures for aplurality of views in preparation for encoding the pictures using themulti-view video coding (MVC) extension of the MPEG-4 AVC Standard isindicated generally by the reference numeral 1400.

The method 1400 includes a start block 1405 that passes control to afunction block 1410. The function block 1410 arranges every N views,among a total of M views, at a particular time instance as asuper-picture in tile format, and passes control to a function block1415. The function block 1415 sets a syntax elementnum_coded_views_minus1, and passes control to a function block 1420. Thefunction block 1420 sets a syntax element view_id[i] for all(num_coded_views_minus1+1) views, and passes control to a function block1425. The function block 1425 sets the inter-view reference dependencyinformation for anchor pictures, and passes control to a function block1430. The function block 1430 sets the inter-view reference dependencyinformation for non-anchor pictures, and passes control to a functionblock 1435. The function block 1435 sets a syntax elementpseudo_view_present_flag, and passes control to a decision block 1440.The decision block 1440 determines whether or not the current value ofthe syntax element pseudo_view_present_flag is equal to true. If so,then control is passed to a function block 1445. Otherwise, control ispassed to an end block 1499.

The function block 1445 sets the following syntax elements, and passescontrol to a function block 1450: tiling_mode;org_pic_width_in_mbs_minus1; and org_pic_height_in_mbs_minus1. Thefunction block 1450 calls a syntax element pseudo_view_info(view_id) foreach coded view, and passes control to the end block 1499.

Turning to FIG. 15, including FIGS. 15A and 15B, an exemplary method forencoding pictures for a plurality of views using the multi-view videocoding (MVC) extension of the MPEG-4 AVC Standard is indicated generallyby the reference numeral 1500.

The method 1500 includes a start block 1502 that has an input parameterpseudo_view_id and passes control to a function block 1504. The functionblock 1504 sets a syntax element num_sub_views_minus1, and passescontrol to a function block 1506. The function block 1506 sets avariable i equal to zero, and passes control to a decision block 1508.The decision block 1508 determines whether or not the variable i is lessthan the number of sub_views. If so, then control is passed to afunction block 1510. Otherwise, control is passed to a function block1520.

The function block 1510 sets a syntax element sub_view_id[i], and passescontrol to a function block 1512. The function block 1512 sets a syntaxelement num_parts_minus1[sub_view_id[i]], and passes control to afunction block 1514. The function block 1514 sets a variable j equal tozero, and passes control to a decision block 1516. The decision block1516 determines whether or not the variable j is less than the syntaxelement num_parts_minus1[sub_view_id[i]]. If so, then control is passedto a function block 1518. Otherwise, control is passed to a decisionblock 1522.

The function block 1518 sets the following syntax elements, incrementsthe variable j, and returns control to the decision block 1516:loc_left_offset[sub_view_id[i]][j]; loc_top_offset[sub_view_id[i]][j];frame_crop_left_offset[sub_view_id[i]][j];frame_crop_right_offset[sub_view_id[i]][j];frame_crop_top_offset[sub_view_id[i]][j]; andframe_crop_bottom_offset[sub_view_id[i][j].

The function block 1520 encodes the current picture for the current viewusing multi-view video coding (MVC), and passes control to an end block1599.

The decision block 1522 determines whether or not a syntax elementtiling_mode is equal to zero. If so, then control is passed to afunction block 1524. Otherwise, control is passed to a function block1538.

The function block 1524 sets a syntax element flip_dir[sub_view_id[i]]and a syntax element upsample_view_flag[sub_view_id[i]], and passescontrol to a decision block 1526. The decision block 1526 determineswhether or not the current value of the syntax elementupsample_view_flag[sub_view_id[i]] is equal to one. If so, then controlis passed to a function block 1528. Otherwise, control is passed to adecision block 1530.

The function block 1528 sets a syntax elementupsample_filter[sub_view_id[i]], and passes control to the decisionblock 1530. The decision block 1530 determines whether or not a value ofthe syntax element upsample_filter[sub_view_id[i]] is equal to three. Ifso, the control is passed to a function block 1532. Otherwise, controlis passed to a function block 1536.

The function block 1532 sets the following syntax elements, and passescontrol to a function block 1534: vert_dim[sub_view_id[i]];hor_dim[sub_view_id[i]]; and quantizer[sub_view_id[i]]. The functionblock 1534 sets the filter coefficients for each YUV component, andpasses control to the function block 1536.

The function block 1536 increments the variable i, and returns controlto the decision block 1508.

The function block 1538 sets a syntax elementpixel_dist_x[sub_view_id[i]] and the syntax elementflip_dist_y[sub_view_id[i]], and passes control to a function block1540. The function block 1540 sets the variable j equal to zero, andpasses control to a decision block 1542. The decision block 1542determines whether or not the current value of the variable j is lessthan the current value of the syntax element num_parts[sub_view_id[i]].If so, then control is passed to a function block 1544. Otherwise,control is passed to the function block 1536.

The function block 1544 sets a syntax elementnum_pixel_tiling_filter_coeffs_minus1[sub_view_id[i]], and passescontrol to a function block 1546. The function block 1546 sets thecoefficients for all the pixel tiling filters, and passes control to thefunction block 1536.

Turning to FIG. 16, an exemplary method for processing pictures for aplurality of views in preparation for decoding the pictures using themulti-view video coding (MVC) extension of the MPEG-4 AVC Standard isindicated generally by the reference numeral 1600.

The method 1600 includes a start block 1605 that passes control to afunction block 1615. The function block 1615 parses a syntax elementnum_coded_views_minus1, and passes control to a function block 1620. Thefunction block 1620 parses a syntax element view_id[i] for all(num_coded_views_minus1+1) views, and passes control to a function block1625. The function block 1625 parses the inter-view reference dependencyinformation for anchor pictures, and passes control to a function block1630. The function block 1630 parses the inter-view reference dependencyinformation for non-anchor pictures, and passes control to a functionblock 1635. The function block 1635 parses a syntax elementpseudo_view_present_flag, and passes control to a decision block 1640.The decision block 1640 determines whether or not the current value ofthe syntax element pseudo_view_present_flag is equal to true. If so,then control is passed to a function block 1645. Otherwise, control ispassed to an end block 1699.

The function block 1645 parses the following syntax elements, and passescontrol to a function block 1650: tiling_mode;org_pic_width_in_mbs_minus1; and org_pic_height_in_mbs_minus1. Thefunction block 1650 calls a syntax element pseudo_view_info(view_id) foreach coded view, and passes control to the end block 1699.

Turning to FIG. 17, including FIGS. 17A and 17B, an exemplary method fordecoding pictures for a plurality of views using the multi-view videocoding (MVC) extension of the MPEG-4 AVC Standard is indicated generallyby the reference numeral 1700.

The method 1700 includes a start block 1702 that starts with inputparameter pseudo_view_id and passes control to a function block 1704.The function block 1704 parses a syntax element num_sub_views_minus1,and passes control to a function block 1706. The function block 1706sets a variable i equal to zero, and passes control to a decision block1708. The decision block 1708 determines whether or not the variable iis less than the number of sub_views. If so, then control is passed to afunction block 1710. Otherwise, control is passed to a function block1720.

The function block 1710 parses a syntax element sub_view_id[i], andpasses control to a function block 1712. The function block 1712 parsesa syntax element num_parts_minus1[sub_view_id[i]], and passes control toa function block 1714. The function block 1714 sets a variable j equalto zero, and passes control to a decision block 1716. The decision block1716 determines whether or not the variable j is less than the syntaxelement num_parts_minus1[sub_view_id[i]]. If so, then control is passedto a function block 1718. Otherwise, control is passed to a decisionblock 1722.

The function block 1718 sets the following syntax elements, incrementsthe variable j, and returns control to the decision block 1716:loc_left_offset[sub_view_id[i]][j]; loc_top_offset[sub_view_id[i]][j];frame_crop_left_offset[sub_view_id[i]][j];frame_crop_right_offset[sub_view_id[i]][j];frame_crop_top_offset[sub_view_id[i]][j]; andframe_crop_bottom_offset[sub_view_id[i][j].

The function block 1720 decodes the current picture for the current viewusing multi-view video coding (MVC), and passes control to a functionblock 1721. The function block 1721 separates each view from the pictureusing the high level syntax, and passes control to an end block 1799.

The separation of each view from the decoded picture is done using thehigh level syntax indicated in the bitstream. This high level syntax mayindicate the exact location and possible orientation of the views (andpossible corresponding depth) present in the picture.

The decision block 1722 determines whether or not a syntax elementtiling_mode is equal to zero. If so, then control is passed to afunction block 1724. Otherwise, control is passed to a function block1738.

The function block 1724 parses a syntax element flip_dir[sub_view_id[i]]and a syntax element upsample_view_flag[sub_view_id[i]], and passescontrol to a decision block 1726. The decision block 1726 determineswhether or not the current value of the syntax elementupsample_view_flag[sub_view_id[i]] is equal to one. If so, then controlis passed to a function block 1728. Otherwise, control is passed to adecision block 1730.

The function block 1728 parses a syntax elementupsample_filter[sub_view_id[i]], and passes control to the decisionblock 1730. The decision block 1730 determines whether or not a value ofthe syntax element upsample_filter[sub_view_id[i]] is equal to three. Ifso, the control is passed to a function block 1732. Otherwise, controlis passed to a function block 1736.

The function block 1732 parses the following syntax elements, and passescontrol to a function block 1734: vert_dim[sub_view_id[i]];hor_dim[sub_view_id[i]]; and quantizer[sub_view_id[i]]. The functionblock 1734 parses the filter coefficients for each YUV component, andpasses control to the function block 1736.

The function block 1736 increments the variable i, and returns controlto the decision block 1708.

The function block 1738 parses a syntax elementpixel_dist_x[sub_view_id[i]] and the syntax elementflip_dist_y[sub_view_id[i]], and passes control to a function block1740. The function block 1740 sets the variable j equal to zero, andpasses control to a decision block 1742. The decision block 1742determines whether or not the current value of the variable j is lessthan the current value of the syntax element num_parts[sub_view_id[i]].If so, then control is passed to a function block 1744. Otherwise,control is passed to the function block 1736.

The function block 1744 parses a syntax elementnum_pixel_tiling_filter_coeffs_minus1[sub_view_id[i]], and passescontrol to a function block 1746. The function block 1776 parses thecoefficients for all the pixel tiling filters, and passes control to thefunction block 1736.

Turning to FIG. 18, an exemplary method for processing pictures for aplurality of views and depths in preparation for encoding the picturesusing the multi-view video coding (MVC) extension of the MPEG-4 AVCStandard is indicated generally by the reference numeral 1800.

The method 1800 includes a start block 1805 that passes control to afunction block 1810. The function block 1810 arranges every N views anddepth maps, among a total of M views and depth maps, at a particulartime instance as a super-picture in tile format, and passes control to afunction block 1815. The function block 1815 sets a syntax elementnum_coded_views_minus1, and passes control to a function block 1820. Thefunction block 1820 sets a syntax element view_id[i] for all(num_coded_views_minus1+1) depths corresponding to view_id[i], andpasses control to a function block 1825. The function block 1825 setsthe inter-view reference dependency information for anchor depthpictures, and passes control to a function block 1830. The functionblock 1830 sets the inter-view reference dependency information fornon-anchor depth pictures, and passes control to a function block 1835.The function block 1835 sets a syntax element pseudo_view_present_flag,and passes control to a decision block 1840. The decision block 1840determines whether or not the current value of the syntax elementpseudo_view_present_flag is equal to true. If so, then control is passedto a function block 1845. Otherwise, control is passed to an end block1899.

The function block 1845 sets the following syntax elements, and passescontrol to a function block 1850: tiling_mode;org_pic_width_in_mbs_minus1; and org_pic_height_in_mbs_minus1. Thefunction block 1850 calls a syntax element pseudo_view_info(view_id) foreach coded view, and passes control to the end block 1899.

Turning to FIG. 19, including FIGS. 19A and 19B, an exemplary method forencoding pictures for a plurality of views and depths using themulti-view video coding (MVC) extension of the MPEG-4 AVC Standard isindicated generally by the reference numeral 1900.

The method 1900 includes a start block 1902 that passes control to afunction block 1904. The function block 1904 sets a syntax elementnum_sub_views_minus1, and passes control to a function block 1906. Thefunction block 1906 sets a variable i equal to zero, and passes controlto a decision block 1908. The decision block 1908 determines whether ornot the variable i is less than the number of sub_views. If so, thencontrol is passed to a function block 1910. Otherwise, control is passedto a function block 1920.

The function block 1910 sets a syntax element sub_view_id[i], and passescontrol to a function block 1912. The function block 1912 sets a syntaxelement num_parts_minus1[sub_view_id[i]], and passes control to afunction block 1914. The function block 1914 sets a variable j equal tozero, and passes control to a decision block 1916. The decision block1916 determines whether or not the variable j is less than the syntaxelement num_parts_minus1[sub_view_id[i]]. If so, then control is passedto a function block 1918. Otherwise, control is passed to a decisionblock 1922.

The function block 1918 sets the following syntax elements, incrementsthe variable j, and returns control to the decision block 1916:loc_left_offset[sub_view_id[i]][j]; loc_top_offset[sub_view_id[i]][j];frame_crop_left_offset[sub_view_id[i]][j];frame_crop_right_offset[sub_view_id[i]][j];frame_crop_top_offset[sub_view_id[i]][j]; andframe_crop_bottom_offset[sub_view_id[i][j].

The function block 1920 encodes the current depth for the current viewusing multi-view video coding (MVC), and passes control to an end block1999. The depth signal may be encoded similar to the way itscorresponding video signal is encoded. For example, the depth signal fora view may be included on a tile that includes only other depth signals,or only video signals, or both depth and video signals. The tile(pseudo-view) is then treated as a single view for MVC, and there arealso presumably other tiles that are treated as other views for MVC.

The decision block 1922 determines whether or not a syntax elementtiling_mode is equal to zero. If so, then control is passed to afunction block 1924. Otherwise, control is passed to a function block1938.

The function block 1924 sets a syntax element flip_dir[sub_view_id[i]]and a syntax element upsample_view_flag[sub_view_id[i]], and passescontrol to a decision block 1926. The decision block 1926 determineswhether or not the current value of the syntax elementupsample_view_flag[sub_view_id[i]] is equal to one. If so, then controlis passed to a function block 1928. Otherwise, control is passed to adecision block 1930.

The function block 1928 sets a syntax elementupsample_filter[sub_view_id[i]], and passes control to the decisionblock 1930. The decision block 1930 determines whether or not a value ofthe syntax element upsample_filter[sub_view_id[i]] is equal to three. Ifso, the control is passed to a function block 1932. Otherwise, controlis passed to a function block 1936.

The function block 1932 sets the following syntax elements, and passescontrol to a function block 1934: vert_dim[sub_view_id[i]];hor_dim[sub_view_id[i]]; and quantizer[sub_view_id[i]]. The functionblock 1934 sets the filter coefficients for each YUV component, andpasses control to the function block 1936.

The function block 1936 increments the variable i, and returns controlto the decision block 1908.

The function block 1938 sets a syntax elementpixel_dist_x[sub_view_id[i]] and the syntax elementflip_dist_y[sub_view_id[i]], and passes control to a function block1940. The function block 1940 sets the variable j equal to zero, andpasses control to a decision block 1942. The decision block 1942determines whether or not the current value of the variable j is lessthan the current value of the syntax element num_parts[sub_view_id[i]].If so, then control is passed to a function block 1944. Otherwise,control is passed to the function block 1936.

The function block 1944 sets a syntax elementnum_pixel_tiling_filter_coeffs_minus1[sub_view_id[i]], and passescontrol to a function block 1946. The function block 1946 sets thecoefficients for all the pixel tiling filters, and passes control to thefunction block 1936.

Turning to FIG. 20, an exemplary method for processing pictures for aplurality of views and depths in preparation for decoding the picturesusing the multi-view video coding (MVC) extension of the MPEG-4 AVCStandard is indicated generally by the reference numeral 2000.

The method 2000 includes a start block 2005 that passes control to afunction block 2015. The function block 2015 parses a syntax elementnum_coded_views_minus1, and passes control to a function block 2020. Thefunction block 2020 parses a syntax element view_id[i] for all(num_coded_views_minus1+1) depths corresponding to view_id[i], andpasses control to a function block 2025. The function block 2025 parsesthe inter-view reference dependency information for anchor depthpictures, and passes control to a function block 2030. The functionblock 2030 parses the inter-view reference dependency information fornon-anchor depth pictures, and passes control to a function block 2035.The function block 2035 parses a syntax elementpseudo_view_present_flag, and passes control to a decision block 2040.The decision block 2040 determines whether or not the current value ofthe syntax element pseudo_view_present_flag is equal to true. If so,then control is passed to a function block 2045. Otherwise, control ispassed to an end block 2099.

The function block 2045 parses the following syntax elements, and passescontrol to a function block 2050: tiling_mode;org_pic_width_in_mbs_minus1; and org_pic_height_in_mbs_minus1. Thefunction block 2050 calls a syntax element pseudo_view_info(view_id) foreach coded view, and passes control to the end block 2099.

Turning to FIG. 21, including FIGS. 21A and 21B, an exemplary method fordecoding pictures for a plurality of views and depths using themulti-view video coding (MVC) extension of the MPEG-4 AVC Standard isindicated generally by the reference numeral 2100.

The method 2100 includes a start block 2102 that starts with inputparameter pseudo_view_id, and passes control to a function block 2104.The function block 2104 parses a syntax element num_sub_views_minus1,and passes control to a function block 2106. The function block 2106sets a variable i equal to zero, and passes control to a decision block2108. The decision block 2108 determines whether or not the variable iis less than the number of sub_views. If so, then control is passed to afunction block 2110. Otherwise, control is passed to a function block2120.

The function block 2110 parses a syntax element sub_view_id[i], andpasses control to a function block 2112. The function block 2112 parsesa syntax element num_parts_minus1[sub_view_id[i]], and passes control toa function block 2114. The function block 2114 sets a variable j equalto zero, and passes control to a decision block 2116. The decision block2116 determines whether or not the variable j is less than the syntaxelement num_parts_minus1[sub_view_id[i]]. If so, then control is passedto a function block 2118. Otherwise, control is passed to a decisionblock 2122.

The function block 2118 sets the following syntax elements, incrementsthe variable j, and returns control to the decision block 2116:loc_left_offset[sub_view_id[i]][j]; loc_top_offset[sub_view_id[i]][j];frame_crop_left_offset[sub_view_id[i]][j];frame_crop_right_offset[sub_view_id[i]][j];frame_crop_top_offset[sub_view_id[i]][j]; andframe_crop_bottom_offset[sub_view_id[i][j].

The function block 2120 decodes the current picture using multi-viewvideo coding (MVC), and passes control to a function block 2121. Thefunction block 2121 separates each view from the picture using the highlevel syntax, and passes control to an end block 2199. The separation ofeach view using high level syntax is as previously described.

The decision block 2122 determines whether or not a syntax elementtiling_mode is equal to zero. If so, then control is passed to afunction block 2124. Otherwise, control is passed to a function block2138.

The function block 2124 parses a syntax element flip_dir[sub_view_id[i]]and a syntax element upsample_view_flag[sub_view_id[i]], and passescontrol to a decision block 2126. The decision block 2126 determineswhether or not the current value of the syntax elementupsample_view_flag[sub_view_id[i]] is equal to one. If so, then controlis passed to a function block 2128. Otherwise, control is passed to adecision block 2130.

The function block 2128 parses a syntax elementupsample_filter[sub_view_id[i]], and passes control to the decisionblock 2130. The decision block 2130 determines whether or not a value ofthe syntax element upsample_filter[sub_view_id[i]] is equal to three. Ifso, the control is passed to a function block 2132. Otherwise, controlis passed to a function block 2136.

The function block 2132 parses the following syntax elements, and passescontrol to a function block 2134: vert_dim[sub_view_id[i]];hor_dim[sub_view_id[i]]; and quantizer[sub_view_id[i]]. The functionblock 2134 parses the filter coefficients for each YUV component, andpasses control to the function block 2136.

The function block 2136 increments the variable i, and returns controlto the decision block 2108.

The function block 2138 parses a syntax elementpixel_dist_x[sub_view_id[i]] and the syntax elementflip_dist_y[sub_view_id[i]], and passes control to a function block2140. The function block 2140 sets the variable j equal to zero, andpasses control to a decision block 2142. The decision block 2142determines whether or not the current value of the variable j is lessthan the current value of the syntax element num_parts[sub_view_id[i]].If so, then control is passed to a function block 2144. Otherwise,control is passed to the function block 2136.

The function block 2144 parses a syntax elementnum_pixel_tiling_filter_coeffs_minus1[sub_view_id[i]], and passescontrol to a function block 2146. The function block 2146 parses thecoefficients for all the pixel tiling filters, and passes control to thefunction block 2136.

Turning to FIG. 22, tiling examples at the pixel level are indicatedgenerally by the reference numeral 2200. FIG. 22 is described furtherbelow.

View Tiling Using MPEG-4 AVC or MVC

An application of multi-view video coding is free view point TV (orFTV). This application requires that the user can freely move betweentwo or more views. In order to accomplish this, the “virtual” views inbetween two views need to be interpolated or synthesized. There areseveral methods to perform view interpolation. One of the methods usesdepth for view interpolation/synthesis.

Each view can have an associated depth signal. Thus, the depth can beconsidered to be another form of video signal. FIG. 9 shows an exampleof a depth signal 900. In order to enable applications such as FTV, thedepth signal is transmitted along with the video signal. In the proposedframework of tiling, the depth signal can also be added as one of thetiles. FIG. 10 shows an example of depth signals added as tiles. Thedepth signals/tiles are shown on the right side of FIG. 10.

Once the depth is encoded as a tile of the whole frame, the high levelsyntax should indicate which tile is the depth signal so that therenderer can use the depth signal appropriately.

In the case when the input sequence (such as that shown in FIG. 1) isencoded using a MPEG-4 AVC Standard encoder (or an encoder correspondingto a different video coding standard and/or recommendation), theproposed high level syntax may be present in, for example, the SequenceParameter Set (SPS), the Picture Parameter Set (PPS), a slice header,and/or a Supplemental Enhancement Information (SEI) message. Anembodiment of the proposed method is shown in TABLE 1 where the syntaxis present in a Supplemental Enhancement Information (SEI) message.

In the case when the input sequences of the pseudo views (such as thatshown in FIG. 1) is encoded using the multi-view video coding (MVC)extension of the MPEG-4 AVC Standard encoder (or an encodercorresponding to multi-view video coding standard with respect to adifferent video coding standard and/or recommendation), the proposedhigh level syntax may be present in the SPS, the PPS, slice header, anSEI message, or a specified profile. An embodiment of the proposedmethod is shown in TABLE 1. TABLE 1 shows syntax elements present in theSequence Parameter Set (SPS) structure, including syntax elementsproposed in accordance with an embodiment of the present principles.

TABLE 1 seq_parameter_set_mvc_extension( ) { C Descriptor num_views_minus_1 ue(v)  for(i = 0; i <= num_views_minus_1; i++)  view_id[i] ue(v)  for(i = 0; i <= num_views_minus_1; i++) {  num_anchor_refs_l0[i] ue(v)   for( j = 0; j < num_anchor_refs_l0[i];j++ )    anchor_ref_l0[i][j] ue(v)   num_anchor_refs_l1[i] ue(v)   for(j = 0; j < num_anchor_refs_l1[i]; j++ )    anchor_ref_l1[i][j] ue(v)  } for(i = 0; i <= num_views_minus_1; i++) {   num_non_anchor_refs_l0[i]ue(v)   for( j = 0; j < num_non_anchor_refs_l0[i]; j++ )   non_anchor_ref_l0[i][j] ue(v)   num_non_anchor_refs_l1[i] ue(v)  for( j = 0; j < num_non_anchor_refs_l1[i]; j++ )   non_anchor_ref_l1[i][j] ue(v)  }  pseudo_view_present_flag u(1)  if(pseudo_view_present_flag) {   tiling_mode   org_pic_width_in_mbs_minus1  org_pic_height_in_mbs_minus1   for( i = 0; i < num_views_minus_1; i++)   pseudo_view_info(i);  } }

TABLE 2 shows syntax elements for the pseudo_view_info syntax element ofTABLE 1, in accordance with an embodiment of the present principles.

TABLE 2 pseudo_view_info (pseudo_view_id) { C Descriptor num_sub_views_minus_1[pseudo_view_id] 5 ue(v)  if(num_sub_views_minus_1 != 0) {   for ( i = 0; i <num_sub_views_minus_1[pseudo_view_id]; i++) {    sub_view_id[i] 5 ue(v)   num_parts_minus1[sub_view_id[ i ]] 5 ue(v)    for( j = 0; j <=num_parts_minus1[sub_view_id[ i ]]; j++ ) {    loc_left_offset[sub_view_id[ i ]] [ j ] 5 ue(v)    loc_top_offset[sub_view_id[ i ]] [ j ] 5 ue(v)    frame_crop_left_offset[sub_view_id[ i ]] [ j ] 5 ue(v)    frame_crop_right_offset[sub_view_id[ i ]] [ j ] 5 ue(v)    frame_crop_top_offset[sub_view_id[ i ]] [ j ] 5 ue(v)    frame_crop_bottom_offset[sub_view_id[ i ]] [ j ] 5 ue(v)    }    if(tiling_mode == 0) {     flip_dir[sub_view_id[ i ][ j ] 5 u(2)    upsample_view_flag[sub_view_id[ i ]] 5 u(1)    if(upsample_view_flag[sub_view_id[ i ]])     upsample_filter[sub_view_id[ i ]] 5 u(2)    if(upsample_fiter[sub_view_id[i]] == 3) {     vert_dim[sub_view_id[i]] 5 ue(v)      hor_dim[sub_view_id[i]] 5ue(v)      quantizer[sub_view_id[i]] 5 ue(v)      for (yuv= 0; yuv< 3;yuv++) {       for (y = 0; y < vert_dim[sub_view_id[i]] − 1; y ++) {       for (x = 0; x < hor_dim[sub_view_id[i]] − 1; x ++)        filter_coeffs[sub_view_id[i]] [yuv][y][x] 5 se(v)       }      }    }    } // if(tiling_mode == 0)    else if (tiling_mode == 1) {    pixel_dist_x[sub_view_id[ i ] ]     pixel_dist_y[sub_view_id[ i ] ]    for( j = 0; j <= num_parts[sub_view_id[ i ]]; j++ ) {     num_pixel_tiling_filter_coeffs_minus1[sub_view_id[ i ] ][j]     for (coeff_idx = 0; coeff_idx <=num_pixel_tiling_filter_coeffs_minus1[sub_view_id[ i ] ][j]; j++)      pixel_tiling_filter_coeffs[sub_view_id[i]][j]     } // for ( j =0; j <= num_parts[sub_view_id[ i ]]; j++ )    } // else if (tiling_mode== 1)   } // for ( i = 0; i < num_sub_views_minus_1; i++)  } // if(num_sub_views_minus_1 != 0) }Semantics of the Syntax Elements Presented in TABLE 1 and TABLE 2

pseudo_view_present_flag equal to true indicates that some view is asuper view of multiple sub-views.

tiling_mode equal to 0 indicates that the sub-views are tiled at thepicture level. A value of 1 indicates that the tiling is done at thepixel level.

The new SEI message could use a value for the SEI payload type that hasnot been used in the MPEG-4 AVC Standard or an extension of the MPEG-4AVC Standard. The new SEI message includes several syntax elements withthe following semantics.

num_coded_views_minus1 plus 1 indicates the number of coded viewssupported by the bitstream. The value of num_coded_views_minus1 is inthe scope of 0 to 1023, inclusive.

org_pic_width_in_mbs_minus1 plus 1 specifies the width of a picture ineach view in units of macroblocks.

The variable for the picture width in units of macroblocks is derived asfollows:PicWidthInMbs=org_pic_width_in_mbs_minus1+1

The variable for picture width for the luma component is derived asfollows:PicWidthInSamplesL=PicWidthInMbs*16

The variable for picture width for the chroma components is derived asfollows:PicWidthInSamplesC=PicWidthInMbs*MbWidthC

org_pic_height_in_mbs_minus1 plus 1 specifies the height of a picture ineach view in units of macroblocks.

The variable for the picture height in units of macroblocks is derivedas follows:PicHeightInMbs=org_pic_height_in_mbs_minus1+1

The variable for picture height for the luma component is derived asfollows:PicHeightInSamplesL=PicHeightInMbs*16

The variable for picture height for the chroma components is derived asfollows:PicHeightInSamplesC=PicHeightInMbs*MbHeightC

num_sub_views_minus1 plus 1 indicates the number of coded sub-viewsincluded in the current view. The value of num_coded_views_minus1 is inthe scope of 0 to 1023, inclusive.

sub_view_id[i] specifies the sub_view_id of the sub-view with decodingorder indicated by i.

num_parts[sub_view_id[i]] specifies the number of parts that the pictureof sub_view_id[i] is split up into.

loc_left_offset[sub_view_id[i]][j] and loc_top_offset[sub_view_id[i]][j]specify the locations in left and top pixels offsets, respectively,where the current part j is located in the final reconstructed pictureof the view with sub_view_id equal to sub_view_id[i].

view_id[i] specifies the view_id of the view with coding order indicateby i.

frame_crop_left_offset[view_id[i]][j],frame_crop_right_offset[view_id[i]][j],frame_crop_top_offset[view_id[i]][j], andframe_crop_bottom_offset[view_id[i]][j] specify the samples of thepictures in the coded video sequence that are part of num_part j andview_id i, in terms of a rectangular region specified in framecoordinates for output.

The variables CropUnitX and CropUnitY are derived as follows:

If chroma_format_idc is equal to 0, CropUnitX and CropUnitY are derivedas follows:CropUnitX=1CropUnitY=2−frame_mbs_only_flag

Otherwise (chroma_format_idc is equal to 1, 2, or 3), CropUnitX andCropUnitY are derived as follows:CropUnitX=SubWidthCCropUnitY=SubHeightC*(2−frame_mbs_only_flag)

The frame cropping rectangle includes luma samples with horizontal framecoordinates from the following:

CropUnitX*frame_crop_left_offset toPicWidthInSamplesL−(CropUnitX*frame_crop_right_offset+1) and verticalframe coordinates from CropUnitY*frame_crop_top_offset to(16*FrameHeightInMbs)−(CropUnitY*frame_crop_bottom_offset+1), inclusive.The value of frame_crop_left_offset shall be in the range of 0 to(PicWidthInSamplesL/CropUnitX)−(frame_crop_right_offset+1), inclusive;and the value of frame_crop_top_offset shall be in the range of 0 to(16*FrameHeightInMbs/CropUnitY)−(frame_crop_bottom_offset+1), inclusive.

When chroma_format_idc is not equal to 0, the corresponding specifiedsamples of the two chroma arrays are the samples having framecoordinates (x/SubWidthC, y/SubHeightC), where (x, y) are the framecoordinates of the specified luma samples.

For decoded fields, the specified samples of the decoded field are thesamples that fall within the rectangle specified in frame coordinates.

num_parts[view_id[i]] specifies the number of parts that the picture ofview_id[i] is split up into.

depth_flag[view_id[i]] specifies whether or not the current part is adepth signal. If depth_flag is equal to 0, then the current part is nota depth signal. If depth_flag is equal to 1, then the current part is adepth signal associated with the view identified by view_id[i].

flip_dir[sub_view_id[i]][j] specifies the flipping direction for thecurrent part. flip_dir equal to 0 indicates no flipping, flip_dir equalto 1 indicates flipping in a horizontal direction, flip_dir equal to 2indicates flipping in a vertical direction, and flip_dir equal to 3indicates flipping in horizontal and vertical directions.

flip_dir[view_id[i]][j] specifies the flipping direction for the currentpart. flip_dir equal to 0 indicates no flipping, flip_dir equal to 1indicates flipping in a horizontal direction, flip_dir equal to 2indicates flipping in vertical direction, and flip_dir equal to 3indicates flipping in horizontal and vertical directions.

loc_left_offset[view_id[i]][j], loc_top_offset[view_id[i]][j] specifiesthe location in pixels offsets, where the current part j is located inthe final reconstructed picture of the view with view_id equals toview_id[i]

upsample_view_flag[view_id[i]] indicates whether the picture belongingto the view specified by view_id[i] needs to be upsampled.upsample_view_flag[view_id[i]] equal to 0 specifies that the picturewith view_id equal to view_id[i] will not be upsampled.upsample_view_flag[view_id[i]] equal to 1 specifies that the picturewith view_id equal to view_id[i] will be upsampled.

upsample_filter[view_id[i]] indicates the type of filter that is to beused for upsampling. upsample_filter[view_id[i]] equals to 0 indicatesthat the 6-tap AVC filter should be used, upsample_filter[view_id[i]]equals to 1 indicates that the 4-tap SVC filter should be used,upsample_filter[view_id[i]] 2 indicates that the bilinear filter shouldbe used, upsample_filter[view_id[i]] equals to 3 indicates that customfilter coefficients are transmitted. When upsample_filter[view_id[i]] isnot present it is set to 0. In this embodiment, we use 2D customizedfilter. It can be easily extended to 1D filter, and some other nonlinearfilter.

vert_dim[view_id[i]] specifies the vertical dimension of the custom 2Dfilter.

hor_dim[view_id[i]] specifies the horizontal dimension of the custom 2Dfilter.

quantizer[view_id[i]] specifies the quantization factor for each filtercoefficient.

filter_coeffs[view_id[i]] [yuv][y][x] specifies the quantized filtercoefficients. yuv signals the component for which the filtercoefficients apply. yuv equal to 0 specifies the Y component, yuv equalto 1 specifies the U component, and yuv equal to 2 specifies the Vcomponent.

pixel_dist_x[sub_view_id[i]] and pixel_dist_y[sub_view_id[i]]respectively specify the distance in the horizontal direction and thevertical direction in the final reconstructed pseudo view betweenneighboring pixels in the view with sub_view_id equal to sub_view_id[i].

num_pixel_tiling_filter_coeffs_minus1[sub_view_id[i][j] plus oneindicates the number of the filter coefficients when the tiling mode isset equal to 1.

pixel_tiling_filter_coeffs[sub_view_id[i][j] signals the filtercoefficients that are required to represent a filter that may be used tofilter the tiled picture.

Tiling Examples at Pixel Level

Turning to FIG. 22, two examples showing the composing of a pseudo viewby tiling pixels from four views are respectively indicated by thereference numerals 2210 and 2220, respectively. The four views arecollectively indicated by the reference numeral 2250. The syntax valuesfor the first example in FIG. 22 are provided in TABLE 3 below.

TABLE 3 pseudo_view_info (pseudo_view_id) { Valuenum_sub_views_minus_1[pseudo_view_id] 3 sub_view_id[0] 0num_parts_minus1[0] 0 loc_left_offset[0][0] 0 loc_top_offset[0][0] 0pixel_dist_x[0][0] 0 pixel_dist_y[0][0] 0 sub_view_id[1] 0num_parts_minus1[1] 0 loc_left_offset[1][0] 1 loc_top_offset[1][0] 0pixel_dist_x[1][0] 0 pixel_dist_y[1][0] 0 sub_view_id[2] 0num_parts_minus1[2] 0 loc_left_offset[2][0] 0 loc_top_offset[2][0] 1pixel_dist_x[2][0] 0 pixel_dist_y[2][0] 0 sub_view_id[3] 0num_parts_minus1[3] 0 loc_left_offset[3][0] 1 loc_top_offset[3][0] 1pixel_dist_x[3][0] 0 pixel_dist_y[3][0] 0

The syntax values for the second example in FIG. 22 are all the sameexcept the following two syntax elements: loc_left_offset[3][0] equal to5 and loc_top_offset[3][0] equal to 3.

The offset indicates that the pixels corresponding to a view shouldbegin at a certain offset location. This is shown in FIG. 22 (2220).This may be done, for example, when two views produce images in whichcommon objects appear shifted from one view to the other. For example,if first and second cameras (representing first and second views) takepictures of an object, the object may appear to be shifted five pixelsto the right in the second view as compared to the first view. Thismeans that pixel(i−5, j) in the first view corresponds to pixel(i, j) inthe second view. If the pixels of the two views are simply tiledpixel-by-pixel, then there may not be much correlation betweenneighboring pixels in the tile, and spatial coding gains may be small.Conversely, by shifting the tiling so that pixel(i−5, j) from view oneis placed next to pixel(i, j) from view two, spatial correlation may beincreased and spatial coding gain may also be increased. This followsbecause, for example, the corresponding pixels for the object in thefirst and second views are being tiled next to each other.

Thus, the presence of loc_left_offset and loc_top_offset may benefit thecoding efficiency. The offset information may be obtained by externalmeans. For example, the position information of the cameras or theglobal disparity vectors between the views may be used to determine suchoffset information.

As a result of offsetting, some pixels in the pseudo view are notassigned pixel values from any view. Continuing the example above, whentiling pixel(i−5, j) from view one alongside pixel(i, j) from view two,for values of i=0 . . . 4 there is no pixel(i−5, j) from view one totile, so those pixels are empty in the tile. For those pixels in thepseudo-view (tile) that are not assigned pixel values from any view, atleast one implementation uses an interpolation procedure similar to thesub-pixel interpolation procedure in motion compensation in AVC. Thatis, the empty tile pixels may be interpolated from neighboring pixels.Such interpolation may result in greater spatial correlation in the tileand greater coding gain for the tile.

In video coding, we can choose a different coding type for each picture,such as I, P, and B pictures. For multi-view video coding, in addition,we define anchor and non-anchor pictures. In an embodiment, we proposethat the decision of grouping can be made based on picture type. Thisinformation of grouping is signaled in high level syntax.

Turning to FIG. 11, an example of 5 views tiled on a single frame isindicated generally by the reference numeral 1100. In particular, theballroom sequence is shown with 5 views tiled on a single frame.Additionally, it can be seen that the fifth view is split into two partsso that it can be arranged on a rectangular frame. Here, each view is ofQVGA size so the total frame dimension is 640×600. Since 600 is not amultiple of 16 it should be extended to 608.

For this example, the possible SEI message could be as shown in TABLE 4.

TABLE 4 multiview_display_info( payloadSize ) { Value num_coded_views_minus1 5  org_pic_width_in_mbs_minus1 40 org_pic_height_in_mbs_minus1 30   view_id[ 0 ] 0   num_parts[view_id[ 0]] 1    depth_flag[view_id[ 0 ]][ 0 ] 0    flip_dir[view_id[ 0 ]][ 0 ] 0   loc_left_offset[view_id[ 0 ]] [ 0 ] 0    loc_top_offset[view_id[ 0 ]][ 0 ] 0    frame_crop_left_offset[view_id[ 0 ]] [ 0 ] 0   frame_crop_right_offset[view_id[ 0 ]] [ 0 ] 320   frame_crop_top_offset[view_id[ 0 ]] [ 0 ] 0   frame_crop_bottom_offset[view_id[ 0 ]] [ 0 ] 240  upsample_view_flag[view_id[ 0 ]] 1   if(upsample_view_flag[view_id[ 0]]) {    vert_dim[view_id[0]] 6    hor_dim[view_id[0]] 6   quantizer[view_id[0]] 32    for (yuv= 0; yuv< 3; yuv++) {     for (y= 0; y < vert_dim[view_id[i]] − 1; y ++) {      for (x = 0; x <hor_dim[view_id[i]] − 1; x ++)       filter_coeffs[view_id[i]][yuv][y][x] XX   view_id[ 1 ] 1   num_parts[view_id[ 1 ]] 1   depth_flag[view_id[ 0 ]][ 0 ] 0    flip_dir[view_id[ 1 ]][ 0 ] 0   loc_left_offset[view_id[ 1 ]] [ 0 ] 0    loc_top_offset[view_id[ 1 ]][ 0 ] 0    frame_crop_left_offset[view_id[ 1 ]] [ 0 ] 320   frame_crop_right_offset[view_id[ 1 ]] [ 0 ] 640   frame_crop_top_offset[view_id[ 1 ]] [ 0 ] 0   frame_crop_bottom_offset[view_id[ 1 ]] [ 0 ] 320  upsample_view_flag[view_id[ 1 ]] 1   if(upsample_view_flag[view_id[ 1]]) {    vert_dim[view_id[1]] 6    hor_dim[view_id[1]] 6   quantizer[view_id[1]] 32    for (yuv= 0; yuv< 3; yuv++) {     for (y= 0; y < vert_dim[view_id[i]] − 1; y ++) {      for (x = 0; x <hor_dim[view_id[i]] − 1; x ++)       filter_coeffs[view_id[i]][yuv][y][x] XX ......(similarly for view 2,3)   view_id[ 4 ] 4  num_parts[view_id[ 4 ]] 2    depth_flag[view_id[ 0 ]][ 0 ] 0   flip_dir[view_id[ 4 ]][ 0 ] 0    loc_left_offset[view_id[ 4 ]] [ 0 ]0    loc_top_offset[view_id[ 4 ]] [ 0 ] 0   frame_crop_left_offset[view_id[ 4 ]] [ 0 ] 0   frame_crop_right_offset[view_id[ 4 ]] [ 0 ] 320   frame_crop_top_offset[view_id[ 4 ]] [ 0 ] 480   frame_crop_bottom_offset[view_id[ 4 ]] [ 0 ] 600    flip_dir[view_id[4 ]][ 1 ] 0    loc_left_offset[view_id[ 4 ]] [ 1 ] 0   loc_top_offset[view_id[ 4 ]] [ 1 ] 120   frame_crop_left_offset[view_id[ 4 ]] [ 1 ] 320   frame_crop_right_offset[view_id[ 4 ]] [ 1 ] 640   frame_crop_top_offset[view_id[ 4 ]] [ 1 ] 480   frame_crop_bottom_offset[view_id[ 4 ]] [ 1 ] 600  upsample_view_flag[view_id[ 4 ]] 1   if(upsample_view_flag[view_id[ 4]]) {    vert_dim[view_id[4]] 6    hor_dim[view_id[4]] 6   quantizer[view_id[4]] 32    for (yuv= 0; yuv< 3; yuv++) {     for (y= 0; y < vert_dim[view_id[i]] − 1; y ++) {      for (x = 0; x <hor_dim[view_id[i]] − 1; x ++)       filter_coeffs[view_id[i]][yuv][y][x] XX

TABLE 5 shows the general syntax structure for transmitting multi-viewinformation for the example shown in TABLE 4.

TABLE 5 multiview_display_info( payloadSize ) { C Descriptor num_coded_views_minus1 5 ue(v)  org_pic_width_in_mbs_minus1 5 ue(v) org_pic_height_in_mbs_minus1 5 ue(v)  for( i = 0; i <=num_coded_views_minus1; i++ ) {   view_id[ i ] 5 ue(v)  num_parts[view_id[ i ]] 5 ue(v)   for( j = 0; j <= num_parts[i]; j++ ){    depth_flag[view_id[ i ]][ j ]    flip_dir[view_id[ i ]][ j ] 5 u(2)   loc_left_offset[view_id[ i ]] [ j ] 5 ue(v)   loc_top_offset[view_id[ i ]] [ j ] 5 ue(v)   frame_crop_left_offset[view_id[ i ]] [ j ] 5 ue(v)   frame_crop_right_offset[view_id[ i ]] [ j ] 5 ue(v)   frame_crop_top_offset[view_id[ i ]] [ j ] 5 ue(v)   frame_crop_bottom_offset[view_id[ i ]] [ j ] 5 ue(v)   }  upsample_view_flag[view_id[ i ]] 5 u(1)  if(upsample_view_flag[view_id[ i ]])    upsample_filter[view_id[ i ]]5 u(2)   if(upsample_fiter[view_id[i]] == 3) {    vert_dim[view_id[i]] 5ue(v)    hor_dim[view_id[i]] 5 ue(v)    quantizer[view_id[i]] 5 ue(v)   for (yuv= 0; yuv< 3; yuv++) {     for (y = 0; y <vert_dim[view_id[i]] − 1;     y ++) {      for (x = 0; x <hor_dim[view_id[i]] − 1;      x ++)       filter_coeffs[view_id[i]][yuv][y][x] 5 se(v)     }    }   }  } }

Referring to FIG. 23, a video processing device 2300 is shown. The videoprocessing device 2300 may be, for example, a set top box or otherdevice that receives encoded video and provides, for example, decodedvideo for display to a user or for storage. Thus, the device 2300 mayprovide its output to a television, computer monitor, or a computer orother processing device.

The device 2300 includes a decoder 2310 that receive a data signal 2320.The data signal 2320 may include, for example, an AVC or an MVCcompatible stream. The decoder 2310 decodes all or part of the receivedsignal 2320 and provides as output a decoded video signal 2330 andtiling information 2340. The decoded video 2330 and the tilinginformation 2340 are provided to a selector 2350. The device 2300 alsoincludes a user interface 2360 that receives a user input 2370. The userinterface 2360 provides a picture selection signal 2380, based on theuser input 2370, to the selector 2350. The picture selection signal 2380and the user input 2370 indicate which of multiple pictures a userdesires to have displayed. The selector 2350 provides the selectedpicture(s) as an output 2390. The selector 2350 uses the pictureselection information 2380 to select which of the pictures in thedecoded video 2330 to provide as the output 2390. The selector 2350 usesthe tiling information 2340 to locate the selected picture(s) in thedecoded video 2330.

In various implementations, the selector 2350 includes the userinterface 2360, and in other implementations no user interface 2360 isneeded because the selector 2350 receives the user input 2370 directlywithout a separate interface function being performed. The selector 2350may be implemented in software or as an integrated circuit, for example.The selector 2350 may also incorporate the decoder 2310.

More generally, the decoders of various implementations described inthis application may provide a decoded output that includes an entiretile. Additionally or alternatively, the decoders may provide a decodedoutput that includes only one or more selected pictures (images or depthsignals, for example) from the tile.

As noted above, high level syntax may be used to perform signaling inaccordance with one or more embodiments of the present principles. Thehigh level syntax may be used, for example, but is not limited to,signaling any of the following: the number of coded views present in thelarger frame; the original width and height of all the views; for eachcoded view, the view identifier corresponding to the view; for eachcoded view, the number of parts the frame of a view is split into; foreach part of the view, the flipping direction (which can be, forexample, no flipping, horizontal flipping only, vertical flipping onlyor horizontal and vertical flipping); for each part of the view, theleft position in pixels or number of macroblocks where the current partbelongs in the final frame for the view; for each part of the view, thetop position of the part in pixels or number of macroblocks where thecurrent part belongs in the final frame for the view; for each part ofthe view, the left position, in the current large decoded/encoded frame,of the cropping window in pixels or number of macroblocks; for each partof the view, the right position, in the current large decoded/encodedframe, of the cropping window in pixels or number of macroblocks; foreach part of the view, the top position, in the current largedecoded/encoded frame, of the cropping window in pixels or number ofmacroblocks; and, for each part of the view, the bottom position, in thecurrent large decoded/encoded frame, of the cropping window in pixels ornumber of macroblocks; for each coded view whether the view needs to beupsampled before output (where if the upsampling needs to be performed,a high level syntax may be used to indicate the method for upsampling(including, but not limited to, AVC 6-tap filter, SVC 4-tap filter,bilinear filter or a custom 1D, 2D linear or non-linear filter).

It is to be noted that the terms “encoder” and “decoder” connote generalstructures and are not limited to any particular functions or features.For example, a decoder may receive a modulated carrier that carries anencoded bitstream, and demodulate the encoded bitstream, as well asdecode the bitstream.

Various methods have been described. Many of these methods are detailedto provide ample disclosure. It is noted, however, that variations arecontemplated that may vary one or many of the specific featuresdescribed for these methods. Further, many of the features that arerecited are known in the art and are, accordingly, not described ingreat detail.

Further, reference has been made to the use of high level syntax forsending certain information in several implementations. It is to beunderstood, however, that other implementations use lower level syntax,or indeed other mechanisms altogether (such as, for example, sendinginformation as part of encoded data) to provide the same information (orvariations of that information).

Various implementations provide tiling and appropriate signaling toallow multiple views (pictures, more generally) to be tiled into asingle picture, encoded as a single picture, and sent as a singlepicture. The signaling information may allow a post-processor to pullthe views/pictures apart. Also, the multiple pictures that are tiledcould be views, but at least one of the pictures could be depthinformation. These implementations may provide one or more advantages.For example, users may want to display multiple views in a tiled manner,and these various implementations provide an efficient way to encode andtransmit or store such views by tiling them prior to encoding andtransmitting/storing them in a tiled manner.

Implementations that tile multiple views in the context of AVC and/orMVC also provide additional advantages. AVC is ostensibly only used fora single view, so no additional view is expected. However, suchAVC-based implementations can provide multiple views in an AVCenvironment because the tiled views can be arranged so that, forexample, a decoder knows that that the tiled pictures belong todifferent views (for example, top left picture in the pseudo-view isview 1, top right picture is view 2, etc).

Additionally, MVC already includes multiple views, so multiple views arenot expected to be included in a single pseudo-view. Further, MVC has alimit on the number of views that can be supported, and such MVC-basedimplementations effectively increase the number of views that can besupported by allowing (as in the AVC-based implementations) additionalviews to be tiled. For example, each pseudo-view may correspond to oneof the supported views of MVC, and the decoder may know that each“supported view” actually includes four views in a pre-arranged tiledorder. Thus, in such an implementation, the number of possible views isfour times the number of “supported views”.

The implementations described herein may be implemented in, for example,a method or process, an apparatus, or a software program. Even if onlydiscussed in the context of a single form of implementation (forexample, discussed only as a method), the implementation of featuresdiscussed may also be implemented in other forms (for example, anapparatus or program). An apparatus may be implemented in, for example,appropriate hardware, software, and firmware. The methods may beimplemented in, for example, an apparatus such as, for example, aprocessor, which refers to processing devices in general, including, forexample, a computer, a microprocessor, an integrated circuit, or aprogrammable logic device. Processing devices also include communicationdevices, such as, for example, computers, cell phones, portable/personaldigital assistants (“PDAs”), and other devices that facilitatecommunication of information between end-users.

Implementations of the various processes and features described hereinmay be embodied in a variety of different equipment or applications,particularly, for example, equipment or applications associated withdata encoding and decoding. Examples of equipment include video coders,video decoders, video codecs, web servers, set-top boxes, laptops,personal computers, cell phones, PDAs, and other communication devices.As should be clear, the equipment may be mobile and even installed in amobile vehicle.

Additionally, the methods may be implemented by instructions beingperformed by a processor, and such instructions may be stored on aprocessor-readable medium such as, for example, an integrated circuit, asoftware carrier or other storage device such as, for example, a harddisk, a compact diskette, a random access memory (“RAM”), or a read-onlymemory (“ROM”). The instructions may form an application programtangibly embodied on a processor-readable medium. As should be clear, aprocessor may include a processor-readable medium having, for example,instructions for carrying out a process. Such application programs maybe uploaded to, and executed by, a machine comprising any suitablearchitecture. Preferably, the machine is implemented on a computerplatform having hardware such as one or more central processing units(“CPU”), a random access memory (“RAM”), and input/output (“I/O”)interfaces. The computer platform may also include an operating systemand microinstruction code. The various processes and functions describedherein may be either part of the microinstruction code or part of theapplication program, or any combination thereof, which may be executedby a CPU. In addition, various other peripheral units may be connectedto the computer platform such as an additional data storage unit and aprinting unit.

As should be evident to one of skill in the art, implementations mayalso produce a signal formatted to carry information that may be, forexample, stored or transmitted. The information may include, forexample, instructions for performing a method, or data produced by oneof the described implementations. Such a signal may be formatted, forexample, as an electromagnetic wave (for example, using a radiofrequency portion of spectrum) or as a baseband signal. The formattingmay include, for example, encoding a data stream, producing syntax, andmodulating a carrier with the encoded data stream and the syntax. Theinformation that the signal carries may be, for example, analog ordigital information. The signal may be transmitted over a variety ofdifferent wired or wireless links, as is known.

It is to be further understood that, because some of the constituentsystem components and methods depicted in the accompanying drawings arepreferably implemented in software, the actual connections between thesystem components or the process function blocks may differ dependingupon the manner in which the present principles are programmed. Giventhe teachings herein, one of ordinary skill in the pertinent art will beable to contemplate these and similar implementations or configurationsof the present principles.

A number of implementations have been described. Nevertheless, it willbe understood that various modifications may be made. For example,elements of different implementations may be combined, supplemented,modified, or removed to produce other implementations. Additionally, oneof ordinary skill will understand that other structures and processesmay be substituted for those disclosed and the resulting implementationswill perform at least substantially the same function(s), in at leastsubstantially the same way(s), to achieve at least substantially thesame result(s) as the implementations disclosed. In particular, althoughillustrative embodiments have been described herein with reference tothe accompanying drawings, it is to be understood that the presentprinciples is not limited to those precise embodiments, and that variouschanges and modifications may be effected therein by one of ordinaryskill in the pertinent art without departing from the scope or spirit ofthe present principles. Accordingly, these and other implementations arecontemplated by this application and are within the scope of thefollowing claims.

The invention claimed is:
 1. A method for decoding a video bitstream bya decoding apparatus, the method comprising: accessing a video picturein the bitstream that includes multiple pictures combined into a singlepicture, wherein the multiple pictures include a first picture from afirst view, and a second picture from a second view; accessinginformation in the bitstream indicating how the multiple pictures in theaccessed video picture are combined, wherein the information indicateswhether at least one of the pictures is individually flipped; anddecoding the video picture into decoded versions of the first pictureand the second picture based on the accessed flipping informationextracted from the bitstream.
 2. The method as claimed in claim 1,wherein the multiple pictures include the first picture from the firstview, and a third picture including depth information for the firstpicture.
 3. The method as claimed in claim 1, wherein the accessedflipping information indicates at least one of the multiple pictureswithin the video picture is flipped in the horizontal or verticaldirection.
 4. The method as claimed in claim 1, wherein the accessedinformation indicates that the multiple pictures are combined in apixel-wise manner.
 5. The method as claimed in claim 1, wherein theaccessing of the video picture, the accessing of the information, thedecoding of the video picture, and the providing of the accessedinformation and the decoded video picture are performed at a decoder. 6.The method as claimed in claim 1, wherein the information is comprisedin at least one high level syntax element.
 7. The method as claimed inclaim 6 wherein the high level syntax element is comprised in at leastone of a slice header, a sequence parameter set, a picture parameterset, a view parameter set, a network abstraction layer unit header, anda supplemental enhancement information message.